Headaches, delayed period. Taking a sophia. Am I pregnant?

Hi, I'm taking a sophia more than 2 years and it's because of the simultaneous headache I decided to change my pill into charlize. I take my sophia last tab, last septmber 23 and i supposed to have my period on september 27. I started take charlize september 24. but until I did'nt have my period. Is it possible that I am pregnant?